diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index 94c1ac6..1480d2c
--- a/Gemfile
+++ b/Gemfile
@@ -14,7 +14,7 @@ gem 'rails', '~> 6.0.1'
 # Use postgresql as the database for Active Record
 gem 'pg', '~> 0.18'
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+gem 'puma', '~> 5.6'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0.7'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index 3289f9a..46f837c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -115,7 +115,8 @@ GEM
       ast (~> 2.4.1)
     pg (0.21.0)
     public_suffix (4.0.6)
-    puma (3.12.6)
+    puma (5.6.7)
+      nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
     rack-test (1.1.0)
@@ -245,7 +246,7 @@ DEPENDENCIES
   jbuilder (~> 2.9.1)
   listen (>= 3.0.5, < 3.2)
   pg (~> 0.18)
-  puma (~> 3.7)
+  puma (~> 5.6)
   rails (~> 6.0.1)
   rspec-rails (= 4.0.0.beta3)
   rspec_junit_formatter